2 weeks is not enough in general for oils to dry. Impasto takes 6 months to 1 year to fully dry.
At this point your painting could dry to a touch dry condition when top layer of paint polymerized but deeper paint is still wet.
Titanium white is a slow drying paint.
don’t worry and give it more time.
Some mediums speed up drying though. If I recall correctly galkid is the one.